Der hetheeington



No Model.) F. A. HETHBRINGTON.

PHOTOGRAPHIU CAMERA SHUTTER.

No 486,855. Patented Sept. 23, 1890.

FIG. I %F Q UNITED STATES PATENT OFFICE.

FREDERICK ALEXANDER I'IETI'IERINGTON, OF BROOKLYN, NEIV YORK, ASSIGNOROF ONE-HALF TO THOMAS E. HIBBEN, OF INDIANAPOLIS,

INDIANA.

PHOTOG RAPHlC-CAM ERA SHUTTER.

SPECIFICATION forming part of Letters Patent No. 436,855, datedSeptember 23, 1890.

Application filed October 22, 1889, Serial No. 327,858. (No model.)

To all whom it may concern.-

Be it known that I, FREDERICK ALEXAN- DER HETHEEINGToN, a citizen of theUnited States, residing at Brooklyn, in the county of Kings and State ofNew York, have invented a new and useful Improvement in Shutters forPhotographic Cameras, of which the following is a specification,reference being had to the accompanying drawings.

Myinvention relates generally to that class of shutters commonly appliedto the detective or hand cameras, although it may also be applied toshutters of the tripod class of calm eras.

The object of this improvement is to provide a simple and efficientmeans of arranging the shutter for time exposure when in stantaneousexposure is not wanted. I attain this object by the device illustratedin the accompanying drawings, in which- Figure 1 is a front view of ashutter of the intermittent rotary type, showingmy i mprovementattached. Fig. 2 is an edge View of the same. Fig. 3 is a frontview of ashutter of the vibrating or oscillating type and illustrates theapplication of my improvement to that style of shutters. Fig. 4 is adetail of the pawl I.

Similar letters refer to similar parts in all the views.

In the intermittent rotary shutter, as shown in Fig. l, A is a thin diskof rubber or other suitable material.

B is the shutter-board, in which the disk is journaled by the shaft orpivot M, the outer end of which is squared to receive a key.

The dotted circle D represents the hole in the shutter-board A throughwhich light passes to the lens.

0 O C are the holes out through the disk A, equidistant apart. As theshutter is rotated in the direction of the arrow each one of these holeswill in turn pass by the opening D in the shutter-board.

This style of shutter is constructed with three small projecting dogs orlugs, as shown in fff. These lugs engage with the trigger E, which is soconstructed that it is impossible for the shutter to make more thanonethird of a revolution each time the trigger is pressed.

In the illustration, II is a spiral spring, and G is a small wire havinga button at the end for the finger. The shutter is geared by a simpleclock inechanism,so that its tendency is to rotate in the direction ofthe-arrow. It is restrained by the foot-piece or flange of the triggerE. If the button G be pressed inward, it will throw the trigger E overso that the lug f will slip down onto the lower flange of the trigger.It is kept there by the pressure of the operators finger until ready forexposure, when the trigger is released, and the disk, being freed, makesone-third of a revolution, and the next lug of the disk engages with thetrigger. It is often desirable, however, to hold the opening 0 in afixed position opposite the openingD for making timed exposure, and toaccomplish this is the object of my improvement, as before stated. Toattain this object I out notches in the periphery of the disk, as shownat 7t 7e Yo. I then pivot to the shutter-board B a small gravity-pawl I.This pawl is hung loosely, and is arranged to drop into the notcheseither by gravity or by the application of a spring back of it. I preferto allow gravity alone to accomplish this purpose, although a spring mayalso be used in cases where necessary.

It will be readily seen that when the shut ter is being used forinstantaneous exposure it will revolve so quickly that the pawl cannothave time to drop into the notches provided for it, and it willtherefore not interfere with instantaneous exposing. If, however, it isdesired to set the shutter for time exposure, it is only necessary toapply a key to the squared shaft M and turn the shutter slowly backward.The pawl will then without any special adjustment automatically dropinto a notch, and thus lock the shutter in that position. It is ofcourse un derstood that when this operation is performed a cap or plugis placed in the exterior opening in the end of the camera proper. The

time exposure is then made by using the cap or plug inthe usual manner.If it be desired to again arrange for instantaneous exposure, it is onlynecessary to apply the key as before and give the shutter a quickbackward rotary movement. Thepawl will then lift, and the shutter-lugcan be again brought to engage with the trigger E.

In Fig. 3 is shown how this device may be applied to an oscillating orvibrating shutter. It may be in the same manner applied to reciprocatingshutters.

I am aware that rotary and vibratory shutters are in use, and thereforedo not claim the shutter, broadly; but

e What I do claim, believing to be new, and desire to protect by LettersPatent, is'

' In a camera-shutter, the combination, with the shutter-disk providedwith peripheral notches, of a gravity pawl or dog independent of thereleasing-trigger and adapted automatically to engage such notches intime exposure'and pass over said notches in instantaneous exposure,substantially as described.

FREDERICK ALEXANDER HE'IHERINGTON.

Witnesses:

' GEORGE R. WILLIAMS,

JAMEs G. HOYT.

